The Bolshaya Tereshka (Russian: Большая Терешка) or simply Tereshka is a river in the Ulyanovsk and Saratov oblasts of the Russian Federation, a right tributary of the Volga. The Tereshka is 273 kilometres (170 mi) long, and its watershed covers 9,680 square kilometres (3,740 sq mi).[1] It begins in the Privolzhskaya Hills and flows to the Volgograd Reservoir. Ice on the Tereshka forms in November or December and thaws in March or April.